Galilei, Galileo
,
The systems of the world
,
1661
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uſe, in the ordinate parts of the World; and we did proceed to
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ſay, that it was not ſo in circular motions, of which that which is
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made by the moveable in it ſelf, ſtill retains it in the ſame place,
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and that which carrieth the moveable by the circumference of a
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circle about its fixed centre, neither puts it ſelf, nor thoſe about it
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in diſorder; for that ſuch a motion primarily is finite and terminate
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(though not yet finiſhed and determined) but there is no point
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in the circumference, that is not the firſt and laſt term in the
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culation; and continuing it in the circumference aſſigned it, it
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leaveth all the reſt, within and without that, free for the uſe of
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others, without ever impeding or diſordering them. </
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>This being
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a motion that makes the moveable continually leave, and
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tinually arrive at the end; it alone therefore can primarily be
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niform; for that acceleration of motion is made in the moveable,
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when it goeth towards the term, to which it hath inclination;
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and the retardation happens by the repugnance that it hath to
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leave and part from the ſame term; and becauſe in circular
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tion, the moveable continually leaves the natural term, and
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tinually moveth towards the ſame, therefore, in it, the
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nance and inclination are always of equal force: from which
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quality reſults a velocity, neither retarded nor accelerated,
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i. </
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>e.
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an
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uniformity in motion. </
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>From this conformity, and from the being
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terminate, may follow the perpetual continuation by ſucceſſively
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reiterating the circulations; which in an undeterminated line,
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and in a motion continually retarded or accelerated, cannot
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turally be. </
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>I ſay, naturally; becauſe the right motion which is
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retarded, is the violent, which cannot be perpetual; and the
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celerate arriveth neceſſarily at the term, if one there be; and if
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there be none, it cannot be moved to it, becauſe nature moves
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not whether it is impoſſible to attain. </
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>I conclude therefore, that
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the circular motion can onely naturally conſiſt with natural
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dies, parts of the univerſe, and conſtituted in an excellent
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ſure; and that the right, at the moſt that can be ſaid for it, is
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aſſigned by nature to its bodies, and their parts, at ſuch time as
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they ſhall be out of their proper places, conſtituted in a depraved
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diſpoſition, and for that cauſe needing to be redured by the
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eſt way to their natural ſtate. </
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>Hence, me thinks, it may
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nally be concluded, that for maintenance of perfect order among ſt
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the parts of the World, it is neceſſary to ſay, that moveables are
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moveable onely circularly; and if there be any that move not
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circularly, theſe of neceſſity are immoveable: there being
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thing but reſt and circular motion apt to the conſervation of
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der. </
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>And I do not a little wonder with my ſelf, that
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Ariſtotle,
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who held that the Terreſtrial globe was placed in the centre of
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the World, and there remained immoveable, ſhould not ſay, that </
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